stalkier

I have a 1988 trans am 5.7. I am going with a carb conversion and I installed a HEI distributor. Now I know how to hook up a standard tach via the tach wire on the distributor marked "tach". Ok, now here's the issue. I want to keep the stock tach. Will the stock tach just work or do I need to hook up an additional wire or something?

mmadden55

Hook it up to the wire on the dist, marked tach. That is all you need.

stalkier

Which wire is the one for the tach? The instrument cluster uses 2 connectors.

stalkier

Ok so I just did a search. I came up with this from another thread.

https://www.thirdgen.org/forums/tech...ooking-up.html

I no longer have the ECM in the vehicle. Would I take the white wire from the harness and run the wire to the "tach" on the distributor? If so, that is easy.

stalkier

after further looking at the diagram I see that it is the white wire on the intrument cluster connector. Is this correct?

redneckjoe

i used a tan wire that came from the drivers side for the factory tach. i have a carb & no ECM.